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/* Copyright (c) 1994 Regents of the University of California */ |
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|
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
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|
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/* |
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* image.c - routines for image generation. |
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* |
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* 10/17/85 |
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*/ |
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|
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#include "standard.h" |
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|
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#include "view.h" |
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|
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#include "resolu.h" |
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|
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#include "paths.h" |
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|
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VIEW stdview = STDVIEW; /* default view parameters */ |
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|
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|
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char * |
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setview(v) /* set hvec and vvec, return message on error */ |
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register VIEW *v; |
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{ |
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static char ill_horiz[] = "illegal horizontal view size"; |
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static char ill_vert[] = "illegal vertical view size"; |
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|
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if (v->vfore < -FTINY || v->vaft < -FTINY || |
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(v->vaft > FTINY && v->vaft <= v->vfore)) |
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return("illegal fore/aft clipping plane"); |
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|
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if (normalize(v->vdir) == 0.0) /* normalize direction */ |
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return("zero view direction"); |
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|
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if (normalize(v->vup) == 0.0) /* normalize view up */ |
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return("zero view up vector"); |
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|
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fcross(v->hvec, v->vdir, v->vup); /* compute horiz dir */ |
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|
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if (normalize(v->hvec) == 0.0) |
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return("view up parallel to view direction"); |
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|
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fcross(v->vvec, v->hvec, v->vdir); /* compute vert dir */ |
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|
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if (v->horiz <= FTINY) |
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return(ill_horiz); |
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if (v->vert <= FTINY) |
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return(ill_vert); |
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|
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switch (v->type) { |
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case VT_PAR: /* parallel view */ |
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v->hn2 = v->horiz; |
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v->vn2 = v->vert; |
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break; |
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case VT_PER: /* perspective view */ |
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if (v->horiz >= 180.0-FTINY) |
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return(ill_horiz); |
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if (v->vert >= 180.0-FTINY) |
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return(ill_vert); |
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v->hn2 = 2.0 * tan(v->horiz*(PI/180.0/2.0)); |
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v->vn2 = 2.0 * tan(v->vert*(PI/180.0/2.0)); |
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break; |
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case VT_CYL: /* cylindrical panorama */ |
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if (v->horiz > 360.0+FTINY) |
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return(ill_horiz); |
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if (v->vert >= 180.0-FTINY) |
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return(ill_vert); |
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v->hn2 = v->horiz * (PI/180.0); |
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v->vn2 = 2.0 * tan(v->vert*(PI/180.0/2.0)); |
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break; |
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case VT_ANG: /* angular fisheye */ |
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if (v->horiz > 360.0+FTINY) |
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return(ill_horiz); |
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if (v->vert > 360.0+FTINY) |
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return(ill_vert); |
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v->hn2 = v->horiz * (PI/180.0); |
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v->vn2 = v->vert * (PI/180.0); |
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break; |
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case VT_HEM: /* hemispherical fisheye */ |
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if (v->horiz > 180.0+FTINY) |
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return(ill_horiz); |
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if (v->vert > 180.0+FTINY) |
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return(ill_vert); |
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v->hn2 = 2.0 * sin(v->horiz*(PI/180.0/2.0)); |
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v->vn2 = 2.0 * sin(v->vert*(PI/180.0/2.0)); |
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break; |
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default: |
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return("unknown view type"); |
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} |
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if (v->type != VT_ANG) { |
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if (v->type != VT_CYL) { |
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v->hvec[0] *= v->hn2; |
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v->hvec[1] *= v->hn2; |
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v->hvec[2] *= v->hn2; |
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} |
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v->vvec[0] *= v->vn2; |
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v->vvec[1] *= v->vn2; |
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v->vvec[2] *= v->vn2; |
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} |
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v->hn2 *= v->hn2; |
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v->vn2 *= v->vn2; |
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|
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return(NULL); |
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} |
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|
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|
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normaspect(va, ap, xp, yp) /* fix pixel aspect or resolution */ |
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double va; /* view aspect ratio */ |
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double *ap; /* pixel aspect in (or out if 0) */ |
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int *xp, *yp; /* x and y resolution in (or out if *ap!=0) */ |
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{ |
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if (*ap <= FTINY) |
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*ap = va * *xp / *yp; /* compute pixel aspect */ |
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else if (va * *xp > *ap * *yp) |
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*xp = *yp / va * *ap + .5; /* reduce x resolution */ |
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else |
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*yp = *xp * va / *ap + .5; /* reduce y resolution */ |
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} |
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|
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|
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double |
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viewray(orig, direc, v, x, y) /* compute ray origin and direction */ |
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FVECT orig, direc; |
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register VIEW *v; |
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double x, y; |
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{ |
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double d, z; |
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|
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x += v->hoff - 0.5; |
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y += v->voff - 0.5; |
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|
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switch(v->type) { |
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case VT_PAR: /* parallel view */ |
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orig[0] = v->vp[0] + v->vfore*v->vdir[0] |
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+ x*v->hvec[0] + y*v->vvec[0]; |
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orig[1] = v->vp[1] + v->vfore*v->vdir[1] |
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+ x*v->hvec[1] + y*v->vvec[1]; |
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orig[2] = v->vp[2] + v->vfore*v->vdir[2] |
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+ x*v->hvec[2] + y*v->vvec[2]; |
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VCOPY(direc, v->vdir); |
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return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0); |
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case VT_PER: /* perspective view */ |
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direc[0] = v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
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direc[1] = v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
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direc[2] = v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
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orig[0] = v->vp[0] + v->vfore*direc[0]; |
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orig[1] = v->vp[1] + v->vfore*direc[1]; |
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orig[2] = v->vp[2] + v->vfore*direc[2]; |
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d = normalize(direc); |
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return(v->vaft > FTINY ? (v->vaft - v->vfore)*d : 0.0); |
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case VT_HEM: /* hemispherical fisheye */ |
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z = 1.0 - x*x*v->hn2 - y*y*v->vn2; |
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if (z < 0.0) |
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return(-1.0); |
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z = sqrt(z); |
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direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
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direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
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direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
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orig[0] = v->vp[0] + v->vfore*direc[0]; |
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orig[1] = v->vp[1] + v->vfore*direc[1]; |
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orig[2] = v->vp[2] + v->vfore*direc[2]; |
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return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0); |
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case VT_CYL: /* cylindrical panorama */ |
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d = x * v->horiz * (PI/180.0); |
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z = cos(d); |
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x = sin(d); |
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direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
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direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
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direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
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orig[0] = v->vp[0] + v->vfore*direc[0]; |
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orig[1] = v->vp[1] + v->vfore*direc[1]; |
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orig[2] = v->vp[2] + v->vfore*direc[2]; |
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d = normalize(direc); |
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return(v->vaft > FTINY ? (v->vaft - v->vfore)*d : 0.0); |
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case VT_ANG: /* angular fisheye */ |
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x *= v->horiz/180.0; |
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y *= v->vert/180.0; |
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d = x*x + y*y; |
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if (d > 1.0) |
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return(-1.0); |
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d = sqrt(d); |
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z = cos(PI*d); |
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d = d <= FTINY ? PI : sqrt(1 - z*z)/d; |
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x *= d; |
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y *= d; |
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direc[0] = z*v->vdir[0] + x*v->hvec[0] + y*v->vvec[0]; |
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direc[1] = z*v->vdir[1] + x*v->hvec[1] + y*v->vvec[1]; |
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direc[2] = z*v->vdir[2] + x*v->hvec[2] + y*v->vvec[2]; |
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orig[0] = v->vp[0] + v->vfore*direc[0]; |
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orig[1] = v->vp[1] + v->vfore*direc[1]; |
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orig[2] = v->vp[2] + v->vfore*direc[2]; |
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return(v->vaft > FTINY ? v->vaft - v->vfore : 0.0); |
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} |
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return(-1.0); |
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} |
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|
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|
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viewloc(ip, v, p) /* find image location for point */ |
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FVECT ip; |
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register VIEW *v; |
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FVECT p; |
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{ |
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double d; |
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FVECT disp; |
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|
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disp[0] = p[0] - v->vp[0]; |
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disp[1] = p[1] - v->vp[1]; |
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disp[2] = p[2] - v->vp[2]; |
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|
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switch (v->type) { |
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case VT_PAR: /* parallel view */ |
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ip[2] = DOT(disp,v->vdir) - v->vfore; |
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break; |
217 |
case VT_PER: /* perspective view */ |
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d = DOT(disp,v->vdir); |
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ip[2] = sqrt(DOT(disp,disp)); |
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if (d < 0.0) { /* fold pyramid */ |
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ip[2] = -ip[2]; |
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d = -d; |
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} |
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if (d > FTINY) { |
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d = 1.0/d; |
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disp[0] *= d; |
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disp[1] *= d; |
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disp[2] *= d; |
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} |
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ip[2] *= (1.0 - v->vfore*d); |
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break; |
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case VT_HEM: /* hemispherical fisheye */ |
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d = normalize(disp); |
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if (DOT(disp,v->vdir) < 0.0) |
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ip[2] = -d; |
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else |
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ip[2] = d; |
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ip[2] -= v->vfore; |
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break; |
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case VT_CYL: /* cylindrical panorama */ |
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ip[2] = DOT(disp,v->vdir); |
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d = DOT(disp,v->hvec); |
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ip[0] = 180.0/PI * atan2(ip[2],d) / v->horiz + 0.5 - v->hoff; |
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ip[1] = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff; |
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if (v->vfore > FTINY) |
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ip[2] = sqrt(DOT(disp,disp)) * |
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(1.0 - v->vfore/sqrt(d*d + ip[2]*ip[2])); |
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else |
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ip[2] = sqrt(DOT(disp,disp)); |
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return; |
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case VT_ANG: /* angular fisheye */ |
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ip[0] = 0.5 - v->hoff; |
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ip[1] = 0.5 - v->voff; |
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ip[2] = normalize(disp) - v->vfore; |
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d = DOT(disp,v->vdir); |
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if (d >= 1.0-FTINY) |
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return; |
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if (d <= -(1.0-FTINY)) { |
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ip[0] += 180.0/v->horiz; |
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return; |
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} |
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d = acos(d)/PI / sqrt(1.0 - d*d); |
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ip[0] += DOT(disp,v->hvec)*d*180.0/v->horiz; |
264 |
ip[1] += DOT(disp,v->vvec)*d*180.0/v->vert; |
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return; |
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} |
267 |
ip[0] = DOT(disp,v->hvec)/v->hn2 + 0.5 - v->hoff; |
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ip[1] = DOT(disp,v->vvec)/v->vn2 + 0.5 - v->voff; |
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} |
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|
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|
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pix2loc(loc, rp, px, py) /* compute image location from pixel pos. */ |
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FLOAT loc[2]; |
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register RESOLU *rp; |
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int px, py; |
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{ |
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register int x, y; |
278 |
|
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if (rp->or & YMAJOR) { |
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x = px; |
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y = py; |
282 |
} else { |
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x = py; |
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y = px; |
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} |
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if (rp->or & XDECR) |
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x = rp->xr-1 - x; |
288 |
if (rp->or & YDECR) |
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y = rp->yr-1 - y; |
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loc[0] = (x+.5)/rp->xr; |
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loc[1] = (y+.5)/rp->yr; |
292 |
} |
293 |
|
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|
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loc2pix(pp, rp, lx, ly) /* compute pixel pos. from image location */ |
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int pp[2]; |
297 |
register RESOLU *rp; |
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double lx, ly; |
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{ |
300 |
register int x, y; |
301 |
|
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x = lx * rp->xr; |
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y = ly * rp->yr; |
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if (rp->or & XDECR) |
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x = rp->xr-1 - x; |
306 |
if (rp->or & YDECR) |
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y = rp->yr-1 - y; |
308 |
if (rp->or & YMAJOR) { |
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pp[0] = x; |
310 |
pp[1] = y; |
311 |
} else { |
312 |
pp[0] = y; |
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pp[1] = x; |
314 |
} |
315 |
} |
316 |
|
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|
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int |
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getviewopt(v, ac, av) /* process view argument */ |
320 |
register VIEW *v; |
321 |
int ac; |
322 |
register char *av[]; |
323 |
{ |
324 |
#define check(c,l) if ((av[0][c]&&av[0][c]!=' ') || \ |
325 |
badarg(ac-1,av+1,l)) return(-1) |
326 |
|
327 |
if (ac <= 0 || av[0][0] != '-' || av[0][1] != 'v') |
328 |
return(-1); |
329 |
switch (av[0][2]) { |
330 |
case 't': /* type */ |
331 |
if (!av[0][3] || av[0][3]==' ') |
332 |
return(-1); |
333 |
check(4,""); |
334 |
v->type = av[0][3]; |
335 |
return(0); |
336 |
case 'p': /* point */ |
337 |
check(3,"fff"); |
338 |
v->vp[0] = atof(av[1]); |
339 |
v->vp[1] = atof(av[2]); |
340 |
v->vp[2] = atof(av[3]); |
341 |
return(3); |
342 |
case 'd': /* direction */ |
343 |
check(3,"fff"); |
344 |
v->vdir[0] = atof(av[1]); |
345 |
v->vdir[1] = atof(av[2]); |
346 |
v->vdir[2] = atof(av[3]); |
347 |
return(3); |
348 |
case 'u': /* up */ |
349 |
check(3,"fff"); |
350 |
v->vup[0] = atof(av[1]); |
351 |
v->vup[1] = atof(av[2]); |
352 |
v->vup[2] = atof(av[3]); |
353 |
return(3); |
354 |
case 'h': /* horizontal size */ |
355 |
check(3,"f"); |
356 |
v->horiz = atof(av[1]); |
357 |
return(1); |
358 |
case 'v': /* vertical size */ |
359 |
check(3,"f"); |
360 |
v->vert = atof(av[1]); |
361 |
return(1); |
362 |
case 'o': /* fore clipping plane */ |
363 |
check(3,"f"); |
364 |
v->vfore = atof(av[1]); |
365 |
return(1); |
366 |
case 'a': /* aft clipping plane */ |
367 |
check(3,"f"); |
368 |
v->vaft = atof(av[1]); |
369 |
return(1); |
370 |
case 's': /* shift */ |
371 |
check(3,"f"); |
372 |
v->hoff = atof(av[1]); |
373 |
return(1); |
374 |
case 'l': /* lift */ |
375 |
check(3,"f"); |
376 |
v->voff = atof(av[1]); |
377 |
return(1); |
378 |
default: |
379 |
return(-1); |
380 |
} |
381 |
#undef check |
382 |
} |
383 |
|
384 |
|
385 |
int |
386 |
sscanview(vp, s) /* get view parameters from string */ |
387 |
VIEW *vp; |
388 |
register char *s; |
389 |
{ |
390 |
int ac; |
391 |
char *av[4]; |
392 |
int na; |
393 |
int nvopts = 0; |
394 |
|
395 |
if (*s != '-') |
396 |
s = sskip(s); |
397 |
while (*s) { |
398 |
ac = 0; |
399 |
do { |
400 |
av[ac++] = s; |
401 |
while (*s && *s != ' ') |
402 |
s++; |
403 |
while (*s == ' ') |
404 |
s++; |
405 |
} while (*s && ac < 4); |
406 |
if ((na = getviewopt(vp, ac, av)) >= 0) { |
407 |
if (na+1 < ac) |
408 |
s = av[na+1]; |
409 |
nvopts++; |
410 |
} else if (ac > 1) |
411 |
s = av[1]; |
412 |
} |
413 |
return(nvopts); |
414 |
} |
415 |
|
416 |
|
417 |
fprintview(vp, fp) /* write out view parameters */ |
418 |
register VIEW *vp; |
419 |
FILE *fp; |
420 |
{ |
421 |
fprintf(fp, " -vt%c", vp->type); |
422 |
fprintf(fp, " -vp %.6g %.6g %.6g", vp->vp[0], vp->vp[1], vp->vp[2]); |
423 |
fprintf(fp, " -vd %.6g %.6g %.6g", vp->vdir[0], vp->vdir[1], vp->vdir[2]); |
424 |
fprintf(fp, " -vu %.6g %.6g %.6g", vp->vup[0], vp->vup[1], vp->vup[2]); |
425 |
fprintf(fp, " -vh %.6g -vv %.6g", vp->horiz, vp->vert); |
426 |
fprintf(fp, " -vo %.6g -va %.6g", vp->vfore, vp->vaft); |
427 |
fprintf(fp, " -vs %.6g -vl %.6g", vp->hoff, vp->voff); |
428 |
} |
429 |
|
430 |
|
431 |
int |
432 |
isview(s) /* is this a view string? */ |
433 |
char *s; |
434 |
{ |
435 |
static char *altname[]={NULL,VIEWSTR,"rpict","rview","pinterp",NULL}; |
436 |
extern char *progname; |
437 |
register char *cp; |
438 |
register char **an; |
439 |
/* add program name to list */ |
440 |
if (altname[0] == NULL) { |
441 |
for (cp = progname; *cp; cp++) |
442 |
; |
443 |
while (cp > progname && !ISDIRSEP(cp[-1])) |
444 |
cp--; |
445 |
altname[0] = cp; |
446 |
} |
447 |
/* skip leading path */ |
448 |
cp = s; |
449 |
while (*cp && *cp != ' ') |
450 |
cp++; |
451 |
while (cp > s && !ISDIRSEP(cp[-1])) |
452 |
cp--; |
453 |
for (an = altname; *an != NULL; an++) |
454 |
if (!strncmp(*an, cp, strlen(*an))) |
455 |
return(1); |
456 |
return(0); |
457 |
} |
458 |
|
459 |
|
460 |
struct myview { |
461 |
VIEW *hv; |
462 |
int ok; |
463 |
}; |
464 |
|
465 |
|
466 |
static |
467 |
gethview(s, v) /* get view from header */ |
468 |
char *s; |
469 |
register struct myview *v; |
470 |
{ |
471 |
if (isview(s) && sscanview(v->hv, s) > 0) |
472 |
v->ok++; |
473 |
} |
474 |
|
475 |
|
476 |
int |
477 |
viewfile(fname, vp, rp) /* get view from file */ |
478 |
char *fname; |
479 |
VIEW *vp; |
480 |
RESOLU *rp; |
481 |
{ |
482 |
struct myview mvs; |
483 |
FILE *fp; |
484 |
|
485 |
if ((fp = fopen(fname, "r")) == NULL) |
486 |
return(-1); |
487 |
|
488 |
mvs.hv = vp; |
489 |
mvs.ok = 0; |
490 |
|
491 |
getheader(fp, gethview, &mvs); |
492 |
|
493 |
if (rp != NULL && !fgetsresolu(rp, fp)) |
494 |
mvs.ok = 0; |
495 |
|
496 |
fclose(fp); |
497 |
|
498 |
return(mvs.ok); |
499 |
} |